公开(公告)号：US20200348710A1

公开(公告)日：2020-11-05

申请号：US16864807

申请日：2020-05-01

申请人： Nordic Semiconductor ASA

发明人： Mikko LINTONEN ,  Jarmo VÄÄNÄNEN ,  Janne JUUSOLA

IPC分类号： G05F3/24 ,  G01R19/165

摘要： A voltage monitoring circuit portion is arranged to monitor a negative supply voltage (Vneg) and comprises a negative voltage generator arranged to generate the negative supply voltage (Vneg) and to output the negative supply voltage (Vneg) at an output terminal. A capacitor is arranged so that a first capacitor plate is connected to the output terminal of the generator and to a reference node via a potential divider. The potential divider is arranged to produce a monitor voltage (Vmonitor) between the resistors, where the reference node is supplied with a positive predetermined reference voltage (Vref). A comparator compares the monitor voltage (Vmonitor) to a threshold voltage (Vref_low) and to produce an output signal having a first value when the monitor voltage (Vmonitor) is below the threshold voltage (Vref_low) and having a second value otherwise. The negative voltage generator is enabled only when the output signal has its second value.